Supernova Remnant G65.2+5.7 (SH2-94 / SH2-96)

Published: Jun 22, 2025
Total integration: 28h 20m
Integration per filter:
Hα: 16h 40m (50 × 1200″)
OIII: 11h 40m (35 × 1200″)

Telescope: William Optics RedCat 91 WIFD
Camera: ZWO ASI2600MM DUO
Mount: ZWO AM5N
Filters: Antlia 3nm Narrowband Oxygen III 2″, Antlia EDGE H-alpha 4.5nm 2″

Software: Adobe Photoshop, Pleiades Astrophoto PixInsight
For more information, visit AstroBin

Supernova Remnant G65.2+5.7 is a faint and expansive structure located in the constellation Cygnus, roughly 2,600 light-years away. Spanning over 3 degrees of the sky, this remnant is one of the largest and oldest known in our galaxy, with an estimated age of 20,000 to 30,000 years.
The remnant is the ghostly aftermath of a massive star’s explosion, its shockwaves still expanding through the interstellar medium. What remains is a complex web of filamentary ionized gas, glowing faintly in emission lines like hydrogen-alpha and oxygen-III. These glowing strands trace the edges of the original blast wave, now slowed by the surrounding dust and gas.
Due to its low surface brightness, G65.2+5.7 is extremely difficult to observe visually and is rarely captured in amateur images. Most of what we know about it comes from deep narrowband imaging and radio/X-ray observations.
This image reveals just a small part of the remnant’s structure, showcasing its delicate, thread-like filaments — a quiet but powerful reminder of the life and death cycle of stars.